I have a 87 jeep comanche, converted it to 4w4 2 years ago and just now finally got it running, had to get transfer case, replaced the switch on that. the four lines runnig to the switch were melted so i cut them and replaced sections with rubber hoses. then found out the vacuum lines were hooked up wrong. once i fixed that the light came on and 4x4 worked great, went in at any speed on the fly. recently it hasnt been working on the fly and i have to stop and go through the gears and then after a moment it will engage. what could be the cause of the slow engaging 4x4?
another thing around 37-45 mph while in 4w4, when i give throttle the truck will shake when i let off it stops. if anyone could answer these questions it would be very much apprecative, thanks